AQA Biology - Proteins (Excellent notes)

This is from AQA Bio AS Level. It is about Proteins very good notes to revise from.

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  • Created on: 12-04-11 22:11
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AS Biology
Section 1 ­ Biological Molecules
Proteins:
Proteins are made of amino acids
There are 20 different amino acids
All amino acids contain:
Carbon
Hydrogen
Oxygen
Nitrogen
And some contain Sulphur
Structure of an Amino Acid:
Every amino acid contains an amino group and a carboxylic acid group
All amino acids have the same structure
R Group can be one of 20 different chemical groups which can make them
Neutral
Acidic
Alkaline
Aromatic (ring structure)
Sulphur containing
Chains of amino acids are held together by strong covalent bonds
2 amino acids joining together is called condensation
When 2 amino acids join, the amino group from one and the acid group from another
form a bond and produce one molecule of water
The bond formed is called a peptide bond
Hydrolysis ­ the opposite of condensation and the breaking of a peptide bond using
a molecule of water
Amino Acids can be arranged in any sequence

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AS Biology
Section 1 ­ Biological Molecules
Proteins can be up to several hundred amino acids long
The order of the amino acids in a protein determines its structure and the structure
of the protein determines how it works.…read more

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